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Nathrop, Colorado
Nathrop is an unincorporated town, a post office, and a census-designated place (CDP) located in and governed by Chaffee County, Colorado, United States. The Nathrop post office has the ZIP code 81236. At the United States Census 2010, the population of the 81236 ZIP Code Tabulation Area was 1,017 including adjacent areas. History Nathrop was named for Charles Nachtrieb, owner of the townsite. In 1880, the Denver and Rio Grande Railroad built through Nathrop as part of their Tennessee Pass line. The tracks were placed out of service in 1997, but Union Pacific, present-day owner of the line, may reach an agreement to reopen it. Geography The Nathrop CDP has an area of , all land. Ruby Mountain Ruby Mountain is a rhyolite outcrop located about one mile northeast of Nathrop. Small spessartite garnet crystals are found throughout the outcropping. Small pebbles of black obsidian referred to as "Apache tears" by collectors can also be found in the talus rock at the base of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Census-designated Place
A census-designated place (CDP) is a concentration of population defined by the United States Census Bureau for statistical purposes only. CDPs have been used in each decennial census since 1980 as the counterparts of incorporated places, such as self-governing cities, towns, and villages, for the purposes of gathering and correlating statistical data. CDPs are populated areas that generally include one officially designated but currently unincorporated community, for which the CDP is named, plus surrounding inhabited countryside of varying dimensions and, occasionally, other, smaller unincorporated communities as well. CDPs include small rural communities, edge cities, colonias located along the Mexico–United States border, and unincorporated resort and retirement communities and their environs. The boundaries of any CDP may change from decade to decade, and the Census Bureau may de-establish a CDP after a period of study, then re-establish it some decades later. Most unin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arkansas Headwaters Recreation Area
The Arkansas Headwaters Recreation Area (AHRA) is one of the United States' most popular locations for whitewater rafting and kayaking on the Arkansas River. There is a total of 150 miles of water that extends from Leadville, Colorado to Pueblo, Colorado and contains many different classes of rapids ranging from Class II-V rapids. Activities within the area include Bicycle Trails, Fishing Guide Service, Hiking/Nature Trails, Horseback Riding Trails, National Forest, Nature Experience, Nature Preserve, Nature Tours, River Raft Trips, Scenic Highway/Byway, Ski/Snowboard Area, State Park, Water Park, Water Recreation. References Protected areas of Chaffee County, Colorado Protected areas of Fremont County, Colorado Protected areas of Lake County, Colorado Protected areas of Colorado Protected areas of Pueblo County, Colorado Protected areas established in 1998 Bureau of Land Management areas in Colorado State parks of Colorado 1998 establishments in Colorado {{Colorado-pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alpine Tunnel
Alpine Tunnel is a narrow gauge railroad tunnel located east of Pitkin, Colorado on the former Denver, South Park and Pacific Railroad route from Denver to Gunnison. At an elevation of , it was the first tunnel constructed through the Continental Divide in Colorado, and according to the U.S. Forest Servicebr>"remains the highest railroad tunnel and the longest narrow gauge tunnel in North America." However, it did not last long in service. Construction began in January 1880 and was scheduled to last for six months but instead dragged on until July 1882, and the line was abandoned in 1910 due to minor damage in the tunnel. Now the tunnel is sealed shut and the remaining trackbed serves as a trail for hikers and bicyclists. History Location of the tunnel portals and establishing a center line of the bore were completed in December 1879. Construction took place from 1880–1881, by Cummings & Co. Construction company, and the tunnel was "holed through" on July 26, 1881. This wa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Census 2020
The United States census of 2020 was the twenty-fourth decennial United States census. Census Day, the reference day used for the census, was April 1, 2020. Other than a pilot study during the 2000 United States census, 2000 census, this was the first U.S. census to offer options to respond online or by phone, in addition to the paper response form used for previous censuses. The census was taken during the COVID-19 pandemic, which affected its administration. The census recorded a resident population of 331,449,281 in the fifty states and the District of Columbia, an increase of 7.4 percent, or 22,703,743, over the preceding decade. The growth rate was the second-lowest ever recorded, and the net increase was the sixth highest in history. This was the first census where the ten most populous states each surpassed 10 million residents as well as the first census where the ten most populous cities each surpassed 1 million residents. Background As required by the United States Cons ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Obsidian
Obsidian () is a naturally occurring volcanic glass formed when lava extrusive rock, extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolite, rhyolitic lava flows known as obsidian flows. These flows have a high content of silicon dioxide, silica, granting them a high viscosity. The high viscosity inhibits atomic diffusion, diffusion of atoms through the lava, which inhibits the first step (nucleation) in the formation of mineral crystals. Together with rapid cooling, this results in a natural glass forming from the lava. Obsidian is hard, Brittleness, brittle, and amorphous; it therefore Fracture (mineralogy)#Conchoidal fracture, fractures with sharp edges. In the past, it was used to manufacture cutting and piercing tools, and it has been used experimentally as surgic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Garnet
Garnets () are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives. All species of garnets possess similar physical properties and crystal forms, but differ in chemical composition. The different species are pyrope, almandine, spessartine, grossular (varieties of which are hessonite or cinnamon-stone and tsavorite), uvarovite and andradite. The garnets make up two solid solution series: pyrope-almandine-spessartine (pyralspite), with the composition range ; and uvarovite-grossular-andradite (ugrandite), with the composition range . Etymology The word ''garnet'' comes from the 14th-century Middle English word ''gernet'', meaning 'dark red'. It is borrowed from Old French ''grenate'' from Latin ''granatus,'' from ''granum'' ('grain, seed'). This is possibly a reference to ''mela granatum'' or even ''pomum granatum'' ('pomegranate', ''Punica granatum''), a plant whose fruits contain abundant and vivid red seed covers ( arils), whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spessartite
Lamprophyres () are uncommon, small-volume ultrapotassic igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks, and small intrusions. They are alkaline silica-undersaturated mafic or ultramafic rocks with high magnesium oxide, >3% potassium oxide, high sodium oxide, and high nickel and chromium. Lamprophyres occur throughout all geologic eras. Archaean examples are commonly associated with lode gold deposits. Cenozoic examples include magnesian rocks in Mexico and South America, and young ultramafic lamprophyres from Gympie in Australia with 18.5% MgO at ~250 Ma. Petrology Modern science treats lamprophyres as a catch-all term for ultrapotassic mafic igneous rocks which have primary mineralogy consisting of amphibole or biotite, and with feldspar in the groundmass. Lamprophyres are not amenable to classification according to modal proportions, such as the system QAPF due to peculiar mineralogy, nor compositional discrimination diagrams, such as TAS ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rhyolite
Rhyolite ( ) is the most silica-rich of volcanic rocks. It is generally glassy or fine-grained (aphanitic) in texture, but may be porphyritic, containing larger mineral crystals (phenocrysts) in an otherwise fine-grained groundmass. The mineral assemblage is predominantly quartz, sanidine, and plagioclase. It is the extrusive equivalent to granite. Rhyolitic magma is extremely viscous, due to its high silica content. This favors explosive eruptions over effusive eruptions, so this type of magma is more often erupted as pyroclastic rock than as lava flows. Rhyolitic ash-flow tuffs are among the most voluminous of continental igneous rock formations. Rhyolitic tuff has been extensively used for construction. Obsidian, which is rhyolitic volcanic glass, has been used for tools from prehistoric times to the present day because it can be shaped to an extremely sharp edge. Rhyolitic pumice finds use as an abrasive, in concrete, and as a soil amendment. Description Rhyolite i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Union Pacific
The Union Pacific Railroad , legally Union Pacific Railroad Company and often called simply Union Pacific, is a freight-hauling railroad that operates 8,300 locomotives over routes in 23 U.S. states west of Chicago and New Orleans. Union Pacific is the second largest railroad in the United States after BNSF, with which it shares a duopoly on transcontinental freight rail lines in the Western, Midwestern and Southern United States. Founded in 1862, the original Union Pacific Rail Road was part of the first transcontinental railroad project, later known as the Overland Route. Over the next century, UP absorbed the Missouri Pacific Railroad, the Chicago and North Western Transportation Company, the Western Pacific Railroad, the Missouri–Kansas–Texas Railroad and the Chicago, Rock Island and Pacific Railroad. In 1996, the Union Pacific merged with Southern Pacific Transportation Company, itself a giant system that was absorbed by the Denver and Rio Grande Western Railroad. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tennessee Pass Line
Tennessee Pass elevation is a high mountain pass in the Rocky Mountains of central Colorado in the United States. The pass was named after Tennessee, the native state of a group of early prospectors. __TOC__ Route The pass traverses the Continental Divide of the Americas, Continental Divide north of Leadville, Colorado, Leadville in a gap between the northern end of the Sawatch Range to the west and the northern end of the Mosquito Range to the east. It connects the headwaters of the Arkansas River to the south with the upper valley of the Eagle River (Colorado), Eagle River (in the watershed of the Colorado River (U.S.), Colorado River) to the north. The pass is traversed by U.S. Highway 24 (Colorado), U.S. Highway 24, allowing access between Leadville and Interstate 70 in Colorado, Interstate 70 in the Eagle Valley. The pass has a gentle approach on both sides with few steep gradients and no major hairpin curves. The summit of the pass is nearly level. The road over the pass i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
